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Have you checked the bulbs already?
Don't know what kind of car you are dealing with here.
Most vehicles - the brake lights and rear turn signals share the same electrical circuit to the rear tailights. Usually the turn signal switch will separate which signal goes to the back.
Do your brake lights work? Is there a High mounted stop lamp and does it work?
I have seen a Hazard Switch be ON and fuse blown causing the Hazard Flasher to be inop - which prevented the turn signals from working. Turning OFF the hazard flasher brought back the T/S.
Check the rest of the lights - see what does and doesn't work - and do the front turn signals flash? Stay On? Or flash really slow?
Let me know what you find out and if this helps you at all.

More likely that the turn signal switch assembly is bad.Have someone watch the tailights(or use a large mirror) to see if the bright tailight filaments come on with the brake pedal held down while you wiggle the hazard light switch.

Try wiggling the hazard light switch while pressing on the brakes.The taillights are connected to the turn signal switch before it goes to the brake switch.The contacts on the hazard switch are probably dirty(I remember this problem years ago,same symptoms-3rd light works but l/R tailights not working).You may just be able to turn the hazards on+off a bunch of times to clean the contacts instead of replacing the switch.

Turn signal switch (also brake light canceling switch) most likely bad or bad wire to it or from it. Check, with key on run, for power into switch. Turn switch on, check for power out. No power out switch bad. Power out, trace to rear tailight harness for broken wire.

If you activate the turn signal switch and you step on the brake pedal, the turn switch (on the steering column) deactivates the brake light to make the signal light more visible. The bulb for the stop and turn lights is the same.

OK if the fuses are good , use a test light and check to be sure you have power at the fuse terminals. you'll check from ground to the terminal on top of the fuse. you should have 12vdc. then , check for power at your brake light switch on both terminals while the brake pedal is pressed, it is located located on the brake pedal assembly. also , check your hazard flasher switch to be sure it is not on. if it was on, check your flashers, both the turn signal and hazard flasher. If everything checks out , your problem is probably in your turn signal switch assembly located in your steering column.